Six years after his tumultuous V8 supercar farewell appearance in Sydney, Peter Brock is back at Oran Park, behind the wheel of a thundering 7.0-litre Holden Monaro.

Brock behind the wheel again and having fun

"Jolly good question," he says when asked why he has returned to regular racing, chasing the Procar Nations Cup Championship.

"Look, I like it," Brock, 58, said as he tried to explain why he's tearing up the bitumen again at a time when most people are buying rocking chairs.

"This category of racing is the closest to how motor sport used to be going back half a generation or so. More relaxed, more fun.

"It's a great atmosphere and the car is brilliant to drive it's got good handling, a good donk , big brakes and, importantly, there's a shortage of grief."

"And the food's good," car owner Garry Rogers chimed in as he prepared lunch for Brock and the crew.

Brock (pictured; above) sits fourth in the Nations Cup standings, behind the Ferrari of John Bowe, the Lamborghini of Paul Stokell and the Monaro of his own teammate Nathan Pretty.

This weekend Brock and Pretty will have a little extra horsepower after a mid-season performance parity adjustment applied by Procar. Stokell, about half the age of Brock, put the screaming V12 Lamborghini on pole yesterday for the three championship races today. Pretty in the Monaro was next, 0.54 seconds slower.

What he is really looking forward to with relish is the second annual Bathurst 24-hour race in November, where he will attempt to give the Monaro its second victory in two years in the twice-around-the-clock epic.